1.使用菜单显示硬盘，内存，虚拟内存的使用率，且显示使用率超过10%硬盘分区。

#!/bin/bash
#
cat << EOF
d|D) show disk usages.
m|M) show memory usages.
s|S) show swap usages.
*) quit.
EOF

echo -n -e "\033[31mYour choice:\033[0m"
read CHOICE
# read -p "Your choice:" CHOICE

while [ $CHOICE != ‘quit‘ -a $CHOICE != ‘q‘ ] ;do
  case $CHOICE in
  d|D)
     echo "disk usages:"
     df -lh | tee -a ./temp.txt
     ;;  
  m|M)
     echo "Memory usages:"
     free -m | grep "Mem"| tee -a ./temp.txt
     ;;  
  s|S)
     echo "swap usages:"
     free -m | grep -i "swap"| tee -a ./temp.txt
     ;;  
  *)  
     echo "Unknow..."
     ;;    
  esac

  echo -n -e "\033[31mAgain, Your choice:\033[0m"
  read CHOICE

  # read -p "Again, Your choice:" CHOICE

done

TI=`egrep [1-8][0-9]% ./temp.txt | wc -l`
echo " show the total size of disk usage >10% ,A total of $TI datas."
egrep "[1-8][0-9]%" ./temp.txt

[root@localhost ~]# ./showdisk.sh
d|D) show disk usages.
m|M) show memory usages.
s|S) show swap usages.
*) quit.
Your choice:s
swap usages:
Swap:         4094          0       4094
Again, Your choice:d
disk usages:
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda5             7.8G  5.2G  2.2G  71% /
/dev/sda11            137G  188M  129G   1% /data
/dev/sda8             3.9G   74M  3.7G   2% /home
/dev/sda7             4.9G  225M  4.4G   5% /var
/dev/sda6             5.9G  141M  5.4G   3% /tmp
/dev/sda3              30G  2.7G   25G  10% /usr
/dev/sda2              49G  180M   46G   1% /u01
/dev/sda1             996M   40M  905M   5% /boot
tmpfs                 3.9G     0  3.9G   0% /dev/shm
/dev/md0              3.8G   72M  3.6G   2% /mnt
Again, Your choice:q
 show the total size of disk usage >10% ,A total of 2 datas.
/dev/sda5             7.8G  5.2G  2.2G  71% /
/dev/sda3              30G  2.7G   25G  10% /usr
[root@localhost ~]#

echo -e "\033[1;32;45mHello\033[0m,world"  

-e \033[1m *** \033[0m 红色部分为固定格式， \033[0m为结束着色；

三组数字用分号（；）分开，绿色1代表加粗，5代表闪烁，可选1-7；

32中3不可变，代表字体着色，2代表七个颜色中绿色，可选1-7；

45中4不可变，代表背景着色，5代表七个颜色中红色，可选1-7；

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Linux命令：使用菜单显示简单功能及echo着色